Adobe Acrobat Reader for Windows
https://get.adobe.com/reader/
Adobe Acrobat Reader for Android
https://www.google.com/url?sa=
Here's the reader to open the books:
https://play.google.com/store/apps/details?id=com.viewer.comicscreen
https://play.google.com/store/apps/details?id=com.adobe.reader
https://play.google.com/store/apps/details?id=com.s2apps.reader
(Click on image to download books)
Books compiled by Brigitta Immaculata (click on image to download books):
List of Saints' Books available to download
Extras (click on image to download books):